Sorry to resurrect an old thread, but this is what I intend to use on my build too. The guy that is driving the project runs an MX5 so it should be straight forward.

It's not intended to be a replacement for some of the higher end off the shelf ECUs, but it does fit well with the build it yourself idea.

I was looking at the BOM of materials and it came to about £40 I think (I've got the spreadsheet for it all somewhere). The designs for the PCB are opensource and we can have them printed anywhere. Might be worth doing a run of them?

I found a couple that I am sure are China based given the cost and lead time. But it does sound like a great project.

I think for IVA it would present a problem as the immobiliser element of the standard setup would be lost. Easy enough to get round I think. 2 circuits associated with starting need to be disabled. Can't be too hard.